Air-filter



L. L. DOLLINGER.

AIR FILTER.

APPLICATION FILED IuNEzs, 1920.

1,359,879., Patented Nov. 23, 1920.

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LEWIS L. DOLLINGER, 0F ROCHESTER, NEW YORK.

AIR-FILTER.

To all whom t ma@ concer/a:

Be it known tha LEWIS L. DoLLrNGE-R, a citizen of theUnit d States, residing at a filter that will take all the solid matter' out of the air and leave the air free from solid matter, abrasives, etc., so that the air will not carry such materials into the cylin` ders of an internal combustion engine or .air compressor. It is also capable cfa variety of-other uses as well.

Another object of the invention is toimake l /the lter of comparatively small volume but with a large area of filtering surface.

These' and other objects of the invention will be fully illustrated in the drawings, Ydescribed in `the specification and -pointed out in the claims at the end thereof.

In the drawings, t i, Y F'gure l is a vperspective view of the filter, ready to be connected up with the intake of a carbureter or other opening.

Fig. 2 is a horizontal section through the filter on the line 2"-.2X of Fig. l.

Fig. 3 is a vertical section on lthe line 3X-3x of Fig.V 2. y

f F ig. 4 is a diagrammatic view showing the placing of the Ifilter on the car with reference to the intake of the carbureter and the manifold and the radiator.

In the drawings, like reference numerals indicate like parts.

In the drawings, reference numeral'l in-4 dicates the cylinder made preferably of ya metal shell `with a large numberof comparatively small perforations therein, which perforations are preferably arranged in a series of parallel rows for -a purpose that will presently appear. The ends of the cylinder are closed by the heads 2 and 3, which heads are also perforated with larger openings as shown in Figs. 1 and 2, the openings at the outer edge of the heads being larger than the openings near the center. The head 3 has a large opening centrally thereof, fitted with'a sleeve 4, which makes a close joint with the head 3. This sleeve extends. into the inside of the drum. and

lforms a flange for holding the several parts Application filled June 23, 1920. Serial No. 391,232.

Specification of Letters Patent. Patented N0V 23, 1920.

holding of the parts in place. Between the two heads is supported the serpentine web 6 lof wire mesh which is bent to anvoutlineshown in crosssection in Fig. 2. The inner bends of this screen are fastened "to the sleeve 7 at one end` and to the sleeve v8 at the other end, by which they are held firmly in place. The sleeve 7 is engaged by the sleeve 4 `on the head 3 and the sleeve 8 is engaged by the, sleeve 5 on the head 2, so

that when the twoheads are in position the serpentine strip of Wire screen isheld firmly in position concentric with 'the shell or cylinder l. The serpentine strip of wire screen is covered with a cloth made up of,` a series of lpockets so as to make a close fit therewith and conform to the outline thereof, as

shown in Fig. 2. As viewed frqmthe outside, this filter-forms a series of outwardly opening pockets and as viewed from the inside, it forms a series of inwardly opening pockets. The pockets; standy radially in either case and are wedge shaped and the filter has the form of a spider.v l l At each end and surrounding the sleeves- 4 and 5 are provided heavy felt washers 9 and l0, which are interposed between the y ends of the screen and the heads, making a dust proof joint between them. These washers also center the screen midway between` the two heads so that vthe air can circulate between each head andthe adjacent end of the screen. f

In practice, the sleeve 4 is coupled with a sictiontube that leads to :the air intake `of 4 the carbureter, etc., and the air is drawn from the inside of the filter and the air is then drawn through-the cloth filtering material which is preferabl of wool feltv a `rent isdrawn centrally into the outwardly opening pockets and transversely through the filtering material. The velocity of the air through the filtering material and iny the outwardly opening pockets is only one- 595- large surface of which 1s exposed. This y' f fourthv or one-fifth of what it iswhen it -I passes through the openings in the cylinder and-there will, therefore, be an opportunity for the dust to precipitate on the lower head and pass through the openings in the lower with a head at each end thereof, a filter head.

It willA be lunderstood that the carrying capacity of the air. current varies approximately directly as the sixth power of the velocity of the current; that is, as regards the weight of the particles carried, and when the velocity is greatly reduced as it.

' vwill be by the arrangementy of my filter, the

solid matter in the air will readily separate itself by gravity from the air and what still remains will be taken out by the filter.

After the air has passed through the filter, it is in the inwardly opening pockets, all of which communicate with the central opening ofthe filter so that the air quickly flows tio the exhaust opening, practically free from irt. It will be noticed that the metal cylinder has no perforations opposite the ends of the inwardly opening pockets so that the inrush of air through the openings of ythe cylinder cannot directly strike the ends of the pockets but must go intol the outwardly opening pockets and must go into these pockets centrally and then moves sidewise tothe filtering surface at a low velocity, permitting the heavy solid matter to separate itself from the air while its velocity is being reduced or retarded in the pockets.- It will also be understood that the dust is not. fQlGed into the filtering material by any high velocity but rests on it lightly due to the low velocity with which it is carried to the filtering surface and the large area of the filtering surfaceand from the filtering surface it is, therefore, easilyshaken off by the vibration of the machine, if any, so that it drops to the bottom of the filter and out through the openings. This makes the filter practically self cleaning, especially where it is used in automobiles, trucks, tractors, etc.

In Fig. 4, I have shown the filter connected to the ca rbureter by a tube 10A, the intake manifold 4being indicated by the numeral 11 and the position of the radiator being indicated by 12. The filter in this in? stance is located at the rearof the engine hood and at the top and out of the path of any air current or draft which will interfere with the precipitation of dust. It is also locatedin a place where it receives the heat of the engine which keeps the filter warm and dry and furnishes warm air as well as clean a1r to the engine and in this way disjpenses withthe need of a stove which is 2. An air filter having a cylindrical shell within said shell having a series of inwardly opening pockets covered with filtering material, arranged radially around central cylindrical openings in the ends of the filter,

an opening in one head having a sleeve eX-' tending therethrough engaging with one of said openings in the filter.

3. An air filter having va serpentine strip of wire screen bent at both ends to form inwardly opening wedge shaped pockets, arranged radially around a cylindrical chamber, cylindrical collars at each end of said chamber to which the folds of the wire screen are attached, a cover of filtering maf terial over all of said pockets.

` 4. An air filter having a serpentine strip of wire screen bent at both ends to form inwardly opening wedge shaped pockets, arranged radially around a cylindrical chamber, cylindrical collars at each end of said chamber to which the folds of the wire screen are attached, a cover of filtering material Y heads, which sleeves engage with the collars on said filter and form a joint therewith.

5. An air filter having a serpentine strip of wire screen bent at both ends to form inwardly opening wedge shaped pockets, ar-' ranged radially around a cylindrical chamber, cylindrical collars at each end of said chamber to which the folds of the wire screen are attached, a cover of filtering material over all of said pockets, a cylindrical shell inclosing said filter, said shell having heads thereonwith sleeves placed centrally on said heads, which sleeves engage with the collars on said filter and form a joint therewith, one

of said sleeves opening outwardly and forming an exhaust for the filten 4 6. An air filter having` a serpentine strip of 'wire screenbent at both ends to form inwardly opening wedge shaped pockets, arranged radially around a cylindrical charnber, cylindrical collars at each end of said chamber to which the folds of the wire screen are attached, a cover of filtering material over all of said pockets, a cylindrical shell inclosing said filter, said shell having heads thereon with sleeves placed centrally on said heads, which sleeves engage with the collars on said filter and form a joint therewith, washers surrounding each sleeve, spacing the filterl from the adjacent head.

7. A filter having a series of outwardly opening pockets` a shell having openings therein in line with the openings in said pockets, the openings in said shell causing the air to enter eachpocket centrally between the walls thereof, said filter being independent of and separate from the cylindrical shell.

8. An air lter having a cylindrical shell, openings through the cylindrical part of saidf shell arranged in parallel rows, alter inside of said shell having outwardly opening pockets in line with said rows of holes, said pockets being located radially to the aXis 0i' the cylinder, heads on the top and bottom of said shell openings in the bottom, head, through which the dust can pass out of the shell.

9. An air ilter having a cylindrical shell, openings through the cylindrical part of said shell arranged in parallel vertical rows, a filter inside Ofsaid shell having outwardly opening vertical pockets in line with said radially to the aXis of the cylinder, heads i on the top and bottom of said shell, openings in thegbottom head throughI which the dust can pass out of the shell. 4 10. An air lter having a serpentine strip of wire screen bent to form inwardly opening wedge shaped pockets, arranged-radially around a cylindrical chamber, cylindrical collars at each end of said chamber to which the folds of the wire screen are attached, a cover of .ltering material over all of said pockets. i

In testimony whereof I affix my signature.

'LEWIS L. DOLLINGER. 

